HP Pavilion Hdx9575la Entertainment Notebook Pc Service Guide

							Grounding guidelines
Electrostatic discharge damage
Electronic components are sensitive to electrostatic discharge (ESD). Circuitry design and structure
determine the degree of sensitivity. Networks built into many integrated circuits provide some protection,
but in many cases, ESD contains enough power to alter device parameters or melt silicon junctions.
A discharge of static electricity from a finger or other conductor can destroy static-sensitive devices or
microcircuitry. Even if the spark is neither felt nor heard, damage may have occurred.
An electronic device exposed to ESD may not be affected at all and can work perfectly throughout a
normal cycle. Or the device may function normally for a while, then degrade in the internal layers,
reducing its life expectancy.
CAUTION:To prevent damage to the computer when you are removing or installing internal
components, observe these precautions:
Keep components in their electrostatic-safe containers until you area ready to install them.
Use nonmagnetic tools.
Before touching an electronic component, discharge static electricity by using the guidelines described in
this section.
Avoid touching pins, leads, and circuitry. Handle electronic components as little as possible.
If you remove a component, place it in an electrostatic-safe container.
The following table shows how humidity affects the electrostatic voltage levels generated by different
activities.
CAUTION:A product can be degraded by as little as 700 V.
Typical electrostatic voltage levels
 
Relative humidity
Event10%40%55%
Walking across carpet35,000 V15,000 V7,500 V
Walking across vinyl floor12,000 V5,000 V3,000 V
Motions of bench worker6,000 V800 V400 V
Removing DIPS from plastic tube2,000 V700 V400 V
Removing DIPS from vinyl tray11,500 V4,000 V2,000 V
Removing DIPS from Styrofoam14,500 V5,000 V3,500 V
Removing bubble pack from PCB26,500 V20,000 V7,000 V
Packing PCBs in foam-lined box 21,000 V 11,000 V 5,000 V
Preliminary replacement requirements 33 
						

							Packaging and transporting guidelines
Follow these grounding guidelines when packaging and transporting equipment:
●To avoid hand contact, transport products in static-safe tubes, bags, or boxes.
●Protect ESD-sensitive parts and assemblies with conductive or approved containers or packaging.
●Keep ESD-sensitive parts in their containers until the parts arrive at static-free workstations.
●Place items on a grounded surface before removing items from their containers.
●Always be properly grounded when touching a component or assembly.
●Store reusable ESD-sensitive parts from assemblies in protective packaging or nonconductive foam.
●Use transporters and conveyors made of antistatic belts and roller bushings. Be sure that mechanized
equipment used for moving materials is wired to ground and that proper materials are selected to
avoid static charging. When grounding is not possible, use an ionizer to dissipate electric charges.
Workstation guidelines
Follow these grounding workstation guidelines:
●Cover the workstation with approved static-shielding material.
●Use a wrist strap connected to a properly grounded work surface and use properly grounded tools
and equipment.
●Use conductive field service tools, such as cutters, screwdrivers, and vacuums.
●When fixtures must directly contact dissipative surfaces, use fixtures made only of static-safe
materials.
●Keep the work area free of nonconductive materials, such as ordinary plastic assembly aids and
Styrofoam.
●Handle ESD-sensitive components, parts, and assemblies by the case or PCM laminate. Handle these
items only at static-free workstations.
●Avoid contact with pins, leads, or circuitry.
●Turn off power and input signals before inserting or removing connectors or test equipment.
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							Equipment guidelines
Grounding equipment must include either a wrist strap or a foot strap at a grounded workstation.
●When seated, wear a wrist strap connected to a grounded system. Wrist straps are flexible straps
with a minimum of one megohm ±10% resistance in the ground cords. To provide proper ground,
wear a strap snugly against the skin at all times. On grounded mats with banana-plug connectors,
use alligator clips to connect a wrist strap.
●When standing, use foot straps and a grounded floor mat. Foot straps (heel, toe, or boot straps) can
be used at standing workstations and are compatible with most types of shoes or boots. On
conductive floors or dissipative floor mats, use foot straps on both feet with a minimum of one megohm
resistance between the operator and ground. To be effective, the conductive strips must be worn in
contact with the skin.
The following grounding equipment is recommended to prevent electrostatic damage:
●Antistatic tape
●Antistatic smocks, aprons, and sleeve protectors
●Conductive bins and other assembly or soldering aids
●Nonconductive foam
●Conductive tabletop workstations with ground cords of one megohm resistance
●Static-dissipative tables or floor mats with hard ties to the ground
●Field service kits
●Static awareness labels
●Material-handling packages
●Nonconductive plastic bags, tubes, or boxes
●Metal tote boxes
●Electrostatic voltage levels and protective materials
The following table lists the shielding protection provided by antistatic bags and floor mats.
MaterialUseVoltage protection level
Antistatic plasticBags1,500 V
Carbon-loaded plasticFloor mats7,500 V
Metallized laminate Floor mats 5,000 V
Preliminary replacement requirements 35 
						

							Unknown user password
If the computer you are servicing has an unknown user password, follow these steps to clear the password.
NOTE:These steps also clear CMOS.
Before disassembling the computer, follow these steps:
1.Shut down the computer. If you are unsure whether the computer is off or in Hibernation, turn the
computer on, and then shut it down through the operating system.
2.Disconnect all external devices connected to the computer.
3.Disconnect the power from the computer by first unplugging the power cord from the AC outlet and
then unplugging the AC adapter from the computer.
4.Remove the battery (see 
Battery on page 38).
5.Remove the RTC battery (see 
RTC battery on page 81).
6.Wait approximately 5 minutes.
7.Replace the RTC battery and reassemble the computer.
8.Connect AC power to the computer. Do not reinsert any batteries at this time.
9.Turn on the computer.
All passwords and all CMOS settings have been cleared.
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							Component replacement procedures
This chapter provides removal and replacement procedures.
There are as many as 154 screws, in 18 different sizes, that must be removed, replaced, or loosened
when servicing the computer. Make special note of each screw size and location during removal and
replacement.
Serial number
Report the computer serial number to HP when requesting information or ordering spare parts. The serial
number is located on the bottom of the computer.
Component replacement procedures 37 
						

							Battery
DescriptionSpare part number
9-cell, 2.55-Ah, 83-Wh battery 448158-001
Before disassembling the computer, follow these steps:
1.Shut down the computer. If you are unsure whether the computer is off or in Hibernation, turn the
computer on, and then shut it down through the operating system.
2.Disconnect all external devices connected to the computer.
3.Disconnect the power from the computer by first unplugging the power cord from the AC outlet and
then unplugging the AC adapter from the computer.
Remove the battery:
1.Turn the computer upside down on a flat surface.
2.Slide the battery release latch (1) to release the battery.
3.Pivot the battery (2) upward and remove it from the computer (3).
To insert the battery, insert the rear edge of the battery into the battery bay and pivot the front edge of
the battery downward until it is seated. The battery release latch automatically locks the battery into place.
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							Computer feet
DescriptionSpare part number
Rubber Feet Kit (includes 11 computer feet in 4 sizes) 452320-001
The computer feet are adhesive-backed rubber pads. The feet attach to the base enclosure in the locations
illustrated below.
Component replacement procedures 39 
						

							Display assembly internal components
NOTE:If it has been determined that the display bezel, camera module, display inverter, display panel,
or speakers are the components that must be replaced to complete the computer repair, the display
assembly does not have to be completely removed from the computer. Replacement of these components
can be completed by removing only the display bezel. Follow the procedures in this section to replace
the display bezel, camera module, display inverter, display panel, or speakers. For information on
replacing the entire display assembly, see 
Display assembly on page 64.
Before removing the display bezel, follow these steps:
1.Shut down the computer. If you are unsure whether the computer is off or in Hibernation, turn the
computer on, and then shut it down through the operating system.
2.Disconnect all external devices connected to the computer.
3.Disconnect the power from the computer by first unplugging the power cord from the AC outlet and
then unplugging the AC adapter from the computer.
4.Remove the battery (see 
Battery on page 38).
Remove the display bezel:
1.Turn the computer display-side up, with the rear panel toward you.
2.Open the computer as far as possible.
3.Remove the two rubber screw covers from the back of the display assembly (1). All rubber screw
covers and logo labels removed in this section are included in the Display Rubber Pad Kit, spare part
number 454595-001.
4.Remove the two Phillips 2.5×5.0 screws (2) that secure the display bezel to the display enclosure.
5.Position the computer with the front toward you.
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							6.Remove the following screw covers and logo labels:
(1) Two rubber screw covers on the display bezel top edge corners
(2) Two rubber screw covers on the display bezel top edge
(3) Four rubber screw covers on the display bezel left and right sides
(4) Speaker logo label on the display bezel lower left edge
(5) Computer model logo label on the display bezel lower right edge
7.Remove the ten Phillips PM2.5×5.0 screws that secure the display bezel to the display assembly.
8.Flex the inside edges of the left and right sides (1) and the top and bottom edges (2) of the display
bezel until the bezel disengages from the display enclosure.
Component replacement procedures 41 
						

							9.Remove the display bezel (3). The display bezel is available using spare part number
452307-001.
10.If it is necessary to replace the camera module, remove the two Phillips PM2.5×5.0 screws (1) that
secure the camera module to the display enclosure.
11.Release the camera module (2) from the display enclosure as far as the camera module cable allows.
12.Disconnect the camera module cable (3) from the camera module.
13.Remove the camera module. The camera module is available using spare part number
452304-001.
14.If it is necessary to replace the display inverter, remove the display inverter (1) from the display
enclosure as far as the two display inverter cables and the backlight cable allow.
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